Hi Ric,
It’s being upgraded to 3.0.1 + edupub.
Collections are supposed to allow opf.collection.link*, which makes @rel
optional, but the rnc schema currently specifies opf.link*. Definitely a
bug.
Collections being reported as not allowed is just odd, if that’s what
you’re getting. Unless they’re in the wrong position in the file (not after the
spine), I can’t reproduce.
Matt